KR950008118B1 - Subscriber line doubling system - Google Patents

Abstract

The doubling system of telephone wire line employs more than one terminal to simultaneously communicate using a communication line. It multiplexes 2 voice signal of a subscriber into 2B+D using U interface to provide a circuit outputting code as 2B1Q (2Binary/1Quaternary). It comprises switching line interfaces (20,20)sending and receiving as B1and B2 channel, a signal multiplexer letting hook-off detection data to send into MCU1 (24), and receiving /sending part (32) receiving and sending 2B1Q line coding/decoding, data of b1,b2 and D channel.

Description

Telephone line doubling system

1 is a conventional telephone line connection state diagram.

2 is a circuit diagram of a telephone line multiplication system according to the present invention.

3 is an operating waveform diagram of a portion of FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone line multiplication system, and more particularly, to a telephone line multiplication system capable of simultaneously communicating by connecting at least one communication terminal to one communication line.

In general, a system for telephony by connecting to a telephone line of an exchange is connected to the communication port of the exchange by 1: 1 as shown in FIG.

As shown in FIG. 1, a communication terminal 7, for example, a telephone, which is connected to the switch 5 via one communication line TL, for example, a telephone, is connected to the switch 5 in a 1: 1 manner to perform telephone communication.

In this connection, when the user picks up the handset of the telephone 7 and hooks it off, the user of the telephone 7 hears a dial tone transmitted from the switch 5. At this time, when the other party's number is pressed by using the keypad of the telephone 7, the switch 5 receives this. That is, if the other party's phone is not in use, the exchange can lift the ring and talk to each other. There is only one track per subscriber.

The above connection method requires one line having two strands when the exchange accepts the subscriber, and two lines are needed if the exchange needs to have two subscriber numbers.

Therefore, when one or more telephone terminals were added to a place where a telephone was installed, for example, a house or an office, a new communication line had to be constructed. In addition, there were inconveniences such as a problem that the hypothesis of the line was generated when the distance between the telephone station and the switchboard, for example, the telephone station, was very long.

It is therefore an object of the present invention to provide a telephone line multiplication system capable of simultaneously making a telephone call by connecting at least two telephone terminals to one telephone line.

Another object of the present invention is a switch interface for multiplexing signals input and output to two subscriber ports of an exchange and transmitting them to one communication line, and demultiplexing and outputting signals of two subscribers received through the communication line to two subscriber ports of the exchange. It provides a terminal (Central Office Terminal).

Another object of the present invention is to multiplex the signals output from two subscribers and transmit them to one communication line, and separate the signals of two subscribers received through the communication line and demultiplex and output them to two subscriber ports (Remote) Terminal is provided.

It is still another object of the present invention to provide a circuit for multiplexing a voice signal of two subscribers into a 2B + D using a UU interface and coding the same as 2B1Q (2Binary / 1Quaternary).

It is still another object of the present invention to provide a signaling multiplexer for multiplexing a signal of two subscribers with a signal of 2B + D.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2A and 2B are circuit diagrams of a telephone line multiplication system according to the present invention, in which signaling of two subscribers (for example, two subscribers is called by two subscribers) output from two subscriber ports PORT1 and PORT2 of an exchange 12; And a switch for transmitting a voice signal to one communication line through a 2B + D channel and separating the 2B + D channel signal inputted to the communication line to the two subscriber ports P ORT1 and PORT2. Interface terminal; A hook state of the first and second subscribers (telephones) STN1 and STN2 is sensed, and a voice signal output from the first and second subscribers STN1 and STN2 together with the detected signal is a 2B + D channel. It is composed of a remote terminal that outputs a communication line as a signal and performs reverse operation thereof.

The configuration of FIG. 2A is connected to the first and second subscriber ports PORT1 and PORT2 of the switch 12, respectively, and detects ring signals output from the respective subscriber ports to detect the first and second ring detection signals RING1, RING2), and in response to the input of the first and second hook-off signals O-SHD1 and O-SHD2 of the subscriber, the input / output signals of the connected subscriber port are digitally coded and decoded to B1, In response to the first and second ring detection signals RING1 and RING2 respectively outputted from the exchange line interfaces 20 and 22 that transmit and receive on the B2 channel, and the exchange line interfaces 20 and 22, respectively. 1, the ring generation signal OR1 (OR2) of the second subscriber's port is output, and the hook-off signals OFF-H1 (OFF-H2) of the first and second subscriber ports are supplied to the switch line interface 20 (22). The first and second ring generation signals OR1 and OR2 outputted from the first microcomputer 24 and the first and second ring generation signals OR1 and OR2 outputted from the MCU1 24 are included in the corresponding microprocessor. A signal multiplexer which multiplexes the channel and outputs the serial stream, and separates the hook-off detection data of the first and second subscribers of the 'D' channel inputted through the serial stream and outputs the signal to the MCU1 (24). ), A communication line 34 and a transmission / reception terminal of the switched line interface 20 and 22, the signal multiplexer 26, and a communication line 34 and the switched line interface 20 and 22. And a first transmitter / receiver 32 connected to an I / O terminal of the signal multiplexer 26 and transmitting and receiving the B1, B2 channel data and the D channel data by 2B 1Q line coding decoding.

In the configuration of FIG. 2A, each of the switch line interfaces 20 and 22 is connected to the first and second subscriber port PORT1 and PORT2 of the switch 12, respectively. Ring detectors 14a and 14b for detecting the input of the first and second ring detection signals RING1 and RING2 to the MCU1 24, and input analog signals as 8-bit PCM data. Codec (18a) and (18b) for decoding to 8-bit PCM data input to the B1, B2 channel, respectively, and output as an analog signal by coding to the B1, B2 channel, and the codec (18a) ( First and second terminals connected between the respective analog input / output terminals 18b) and the first and second subscriber ports POR T1 and PORT2 of the switch 12, respectively, and are output from the MCU1 24. Each of the switching line interfaces 16a and 16b forms a talk current loop in response to input of the hook-off signals OFF-H1 and OFF-H2 of the subscriber.

That is, the exchange line interfaces 16a and 16b generate impedance matching and off-hook conditions so that voice signals can be exchanged in response to the input of the hook-off signal.

The first transmitter / receiver 32 converts the B1 and B2 channel data and the D channel data output from the transceivers of the codecs 18a and 18b and the transceiver terminals of the signal multiplexer 26 into 2B1Q data. The U transceiver 28 and 4 of the U transceiver 28, which are line coded and output 2B1Q line coded data into 2B + D data and output to the codec 18a, 18b and the signal multiplexer 26, respectively. It consists of a balance network 30 which converts line output into signals of two lines of the communication line 34 and removes echo (ECHO).

The configuration of FIG. 2B is connected to each of the second subscribers STN1 and STN2, detects off-hooks of connected subscribers, and outputs off-hook detection signals H-DET, and subscriber control signals CX1. Subscriber interface (42) (44) for ring transmission and interruption and subscriber line control in response to the input of CX2 and CX3, and coding / decoding the voice signal of the subscriber and transmitting and receiving through B1 and B2 channels, respectively; The hook-off data O-OFF-H1 (O-OFF) in response to the input of the hook-off detection signals H-DET1 and H-DET2 output from the first and second subscriber interface 42 and 44, respectively. -H2) and the subscriber line control signal to the first and second subscriber interface 42 and 44, and the ring enable signal RINGE1 of the first and second subscriber stations STN1 and STN2. A second microcomputer (hereinafter referred to as " MCU2 ") 46 which supplies a ring transmission control signal to the first and second subscriber interface 42 and 44 in response to an input of RINGE2; The hook-off data (O-OFF-H1) (O-OFF-H2) output from the MCU1 (24) is multiplexed to the corresponding channel D and output as a serial stream, and output to the channel D input as a serial stream. A signal multiplexer which multiplexes and outputs a serial stream, and separates the ring enable data RINGE1 and RINGE2 of the first and second subscribers of the D channel, which are input to the stream stream, and outputs them to the MCU1 24. A multiplexer (48), the communication line (34) and the transmission and reception terminals of the first and second subscriber interface (42) (44) and the input / output terminals of the signal multiplexer (48) to connect the B1 and B2 channels. And a second transmitting / receiving unit 54 for transmitting and receiving data and data of the D-channel by 2B1Q line coding / decoding, and a ring signal generator 56 for generating a ring signal.

Each of the first and second subscriber interfaces 42 and 44 in the configuration of FIG. 2b is connected between the first and second subscriber stations STN1 and STN2 and the ring signal generator 56, respectively. Ring relays 38a and 38b for supplying the generated ring signal to the first and second subscribers STN1 and STN2, and the first and second subscribers through the ring relays 38a and 38b. Connected to (STN1) (STN2) and supplying a talk current to the subscriber and detecting a change in the supply current to output an off-hook detection signal (H-DET1) (H-DET2) of the subscriber, respectively. Subscriber line interface circuits (hereinafter, " SLIC ") which provide ring transmission signals RC1 and RC2 to the ring relays 38a and 38b, respectively, by inputting subscriber control signals CX1, CX2 and CX3. 36a and 36b and the input analog signals outputted from the SLICs 36a and 36b, respectively, are coded with 8-bit PCM data and corresponding B1 and B2 frames are used. And output to, consists of the B1, B2 channels to the codec (40a) (40b) each output to a SLIC (36a) (36b) for the analog signal to decode the PCM data from the 8-bit input, respectively.

3 is an operation waveform diagram of a part of FIGS. 2A and 2B, which shows an example of input / output of the signal multiplexers 26 and 48 and transmission / reception data (2B + D) of the U transceivers 50 and 28. to be.

Hereinafter, the operation of FIG. 2 according to the present invention will be described in detail with reference to FIG.

First, when the exchange 12 sends the ring to the first and second particle ports PORT1 and PORT2, the reception operation of the first and second subscribers STN1 and STN2 will be described.

[Called by subscribers]

If the ring 12 for supplying the first and second subscriber stations STN1 and STN2 to the first and second subscriber ports PORT1 and PORT2 is now supplied from the exchanger 12, a ring detector ( The ring signal is detected by the ring signals 14a and 14b and the ring detection signals RING1 and RING2 are transmitted to the MCU1 24. At this time, the MCU1 24 receives the signal and outputs ring data OR1 (OR2) corresponding thereto.

The ring data OR1 and OR2 output from the MCU1 24 are input to a signal multiplexer 26. At this time, the signal multiplexer 26 sends this to the U transceiver 28 in the D1 and D2 channels as shown in FIG. 3 (a), and the U transceiver 28 transmits 2B + D (8bit, 8bit, 2 bit) is converted into a 2B1Q signal (Signal) and transmitted to the U transceiver 50 through the balance network 52 of the remote terminal through the balance network 30. The U transceiver 50 decodes the input 2B1Q signal into 2B + D and transmits it to IDL TX. At this time, the signal multiplexer 48 of the remote terminal extracts the D1 and D2 channels of the D channel from the 2B + D channels and outputs a ring enable signal RINGE1 (RINGE2), and the MCU2 46 outputs the extracted signal. The control signals C11 to C13 and C21 to C23 of the SLIC 36a and 36b are operated as shown in the following table to send out the ring control signals of the SLIC 36a and 36b to relay 38a and 38b. It is connected to the ring generator 56 side.

By the above operation, the ring signal is supplied to the first and second subscriber members STN1 and STN2. When the first and second subscribers STN1 and STN2 are hooked off by the ring signal supply, the SLIC 36a and 36b detects the off-hook detection signals H-DET1 and H-DET2. ), And the MCU2 46 receives this signal and outputs the off-hook data O-OFF-HOOK1 (O-OFF-HOODK2) as shown in FIG. 3 (d) (e).

TABLE 1

The control signals CX1, CX2, and CX3 of # 010 are outputted to the SLIC 36a and 36b, and the SLICs 36a and 36b and the first and second subscriber stations STN1 and STN2 are respectively output. Connect to the channel.

On the other hand, the off-hook data (O-OFF-H1) (O-OFF-H2) output from the MCU2 (46) separates the signal multiplexer (48) as shown in FIG. Send it to the “D” channel of the RX.

When the U transceiver 50 codes the signal input to the IDL RX and outputs the signal to the balance network 52 in the above operation, this is performed by the communication line 34, the balance network 30, and the U transceiver 28. Output to IDL RX. At this time, the signal multiplexer 26 of the COT outputs D1 and D2 of the 'D' channel to output off-hook data (OFF-H1) (OFF-H2). The MCU1 24 receives the off-hook data (OFF-H1) (OFF-H2) signal and outputs (O-SHD1) (O-SH D2) to receive the exchange line interface 16a (16b). The sink sinks approximately 20 mA of current as if the phone were off hooked, allowing the exchange 12 to recognize HOO K-OFF. That is, a currency loop is formed.

When the exchange path receives the signal and the call path is established, the voice signal from the exchange 12 side is connected to the switch line interfaces 16a and 16b to the respective codecs 18a and 18b. 18a) and 18b digitalize the input analog voice signal into an 8-bit PCM signal and transmit it to the IDL RX. The signal transmitted from the codecs 18a and 18b is loaded into the U transceiver 28 on the B1 and B2 channels and converted into a 2B1Q signal and transmitted to the communication line 34. The signal is transmitted to the U transceiver 50 as a signal through the communication line 34, and is output to B1 and B2 of the IDL TX.

Eight bits of the B1 channel transmitted from the U transceiver 50 are input to the codec 42a, and eight bits of the B2 channel are input to the codec 40b. At this time, the codecs 40a and 40b are converted into analog signals by 8 bits of the input B1 and B2 channels, respectively, and are inputted to the SLIC 36a and 36b. The SLICs 36a and 36b transmit the input analog signals to the first and second subscribers STN1 S TN2 so that they can be heard by the subscriber telephone.

Voice signals from the first and second subscribers STN1 and STN2 are transmitted to the exchange in the reverse direction.

[Calling]

When the first and second subscribers STN1 and STN2 are hooked off, the hook-off detection signals H-DET1 and H-DET2 of the SLIC 36a and 36b are output. When it is input to the hook sensing signal (O-SHD1) (O-SHD2) which is transmitted to the COT through the channel and is output from the MCU1 (24) as described above, and satisfies the hook-off condition at the switch 12, The exchange 12 receives this signal and sends out a dial tone.

The dial tone is transmitted to the first and second subscribers STN1 and STN2 through the same path as the voice signal, and when the first and second subscribers STN1 and STN2 press a digit, the voice signal is transmitted. Via the path b) If it is mechanical, it can be transferred to the exchange 12 via D1 (D0) to call the other party. As described in D2 above, COT (1) -RT (1) uses B1 and D1 and COT (2) -PT (2) can use B2 and D2 at the same time so that two subscribers can be connected as one line. Become.

As described above, according to the present invention, the voice call service of two telephone subscribers can be performed using one communication line, so that the subscriber can be added without a line, and the subscriber addition can be made at low cost.

Claims (1)

In a telephone line multiplication system having an exchange 12 for accepting a plurality of telephony subscribers and one or more subscribers accommodated in the exchange, the first and second subscriber ports PORT1 and PORT2 of the exchange 12. Detect ring signals output from the respective subscriber ports connected to each other to output the first and second ring detection signals RING1 and RING2, and the first and second hook-off signals O-SHD1 and O- of the corresponding subscriber. A switch line interface 20 and 22 for coding and decoding input / output signals of the connected subscriber port into digital signals in response to an input of the SHD2), and transmitting and receiving the signals to and from the B1 and B2 channels, respectively, and the switch line interface 20. In response to the first and second ring detection signals RING1 and RING2 respectively output from 22, the ring generation signals OR1 and OR2 of the corresponding first and second subscriber ports are output. Provide the subscriber's hook-off signal (OFF-H1) (OF F-H2) to the switched line interface unit (20, 22) Multiplexes the first controller 24 and the first and second ring generation signals OR1 and OR2 output from the first control 24 to the corresponding D channel and outputs the serial stream. A signal multiplexer 26 which separates the hook-off detection data of the first and second subscribers into the D-channel input to the first controller 24, and outputs the signal multiplexer 26, one communication line 34 and the switching line. A first transmitter / receiver 32 connected to a transmission / reception terminal of the interface 20 and 22 and an input / output terminal of the signal multiplexer 26 to transmit / receive the B1, B2 channel data and the D channel data by 2B1Q line coding / decoding. An exchange interface terminal consisting of; It is connected to the first and second subscribers STN1 and STN2, respectively, and detects the off-hook of the connected subscriber and outputs the off-hook detection signal H-DET, and the subscriber control signals CX1, CX2, Subscriber interface 42 (44) for ring transmission and interruption and subscriber line control in response to the input of CX3), and for coding / decoding the voice signal of the subscriber and transmitting and receiving through B1 and B2 channels, respectively; The hook-off data (O-OFF-H1) (O-OFF-H2) is input to the inputs of the hook-off detection signals (H-DET1) and (H-DET2) respectively output from the second subscriber interface (4 2) (44). At the same time, the subscriber line control signal is output to the first and second subscriber interfaces 42 and 44, and the ring enable signals RINGE1 and RINGE2 of the first and second subscriber stations STN1 and TN2 are output. A second controller 46 for supplying a ring transmission control signal to the first and second subscriber interfaces 42 and 44 in response to an input of a; and a hook O output from the second controller 24. Ring data of the first and second subscribers of the 'D' channel inputted to the serial stream by multiplexing the data (O-OFF-H1) (O-OFF-H2) to the corresponding 'D' channel. A signal multiplexer 48 that separates the data RINGE1 and RINGE2 and outputs them to the second controller 24, the one communication line 34, and the first and second subscriber interface 42 and 44. It consists of a remote terminal consisting of a second transmission and reception unit 54 connected to the transmission and reception terminals of the signal multiplexer 48 and the input and output terminals of the signal multiplexer 48 to transmit and receive the B1, B2 channel data and D channel data by 2B1Q line coding / decoding. Circuit characterized in that.